linux-hardening - Re: [RFC][PATCH v3 15/16] kmemdump: Add Kinfo backend driver

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Message-Id: <DCTZLTRX455M.95MSJULLX6VC@linaro.org>
Date: Tue, 16 Sep 2025 06:48:59 +0100
From: "Alexey Klimov" <alexey.klimov@...aro.org>
To: "Eugen Hristev" <eugen.hristev@...aro.org>
Cc: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-mm@...ck.org>, <tglx@...utronix.de>, <andersson@...nel.org>,
 <pmladek@...e.com>, <rdunlap@...radead.org>, <corbet@....net>,
 <david@...hat.com>, <mhocko@...e.com>, <tudor.ambarus@...aro.org>,
 <mukesh.ojha@....qualcomm.com>, <linux-arm-kernel@...ts.infradead.org>,
 <linux-hardening@...r.kernel.org>, <jonechou@...gle.com>,
 <rostedt@...dmis.org>, <linux-doc@...r.kernel.org>,
 <devicetree@...r.kernel.org>
Subject: Re: [RFC][PATCH v3 15/16] kmemdump: Add Kinfo backend driver

On Fri Sep 12, 2025 at 4:08 PM BST, Eugen Hristev wrote:

[..]

> --- /dev/null
> +++ b/mm/kmemdump/kinfo.c
> @@ -0,0 +1,293 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + *
> + * Copyright 2002 Rusty Russell <rusty@...tcorp.com.au> IBM Corporation
> + * Copyright 2021 Google LLC
> + * Copyright 2025 Linaro Ltd. Eugen Hristev <eugen.hristev@...aro.org>
> + */
> +#include <linux/platform_device.h>
> +#include <linux/kallsyms.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/kmemdump.h>
> +#include <linux/module.h>
> +#include <linux/utsname.h>

Could you please check if the headers are sorted here
and in all other patches in this series?

Also module.h is duplicated.

[..]

> +static int build_info_set(const char *str, const struct kernel_param *kp)
> +{
> +	struct kernel_all_info *all_info = kinfo->all_info_addr;

here ^^

> +	size_t build_info_size;
> +
> +	if (kinfo->all_info_addr == 0 || kinfo->all_info_size == 0)
> +		return -ENAVAIL;
> +
> +	all_info = (struct kernel_all_info *)kinfo->all_info_addr;

Maybe assignment of all_info on declaration in the beginning of this function
is not needed then?

> +	build_info_size = sizeof(all_info->info.build_info);
> +
> +	memcpy(&all_info->info.build_info, str, min(build_info_size - 1,
> +						    strlen(str)));
> +	update_kernel_all_info(all_info);
> +
> +	if (strlen(str) > build_info_size) {
> +		pr_warn("%s: Build info buffer (len: %zd) can't hold entire string '%s'\n",
> +			__func__, build_info_size, str);
> +		return -ENOMEM;
> +	}
> +
> +	return 0;
> +}

[...]

Best regards,
Alexey